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   "source": [
    "## 上周回顾\n",
    "> * 1.list的一般方法/函数的使用及案例，如：\n",
    ">> 1. append() 增加，增加list元素到list的末尾，常用于新建列表\n",
    ">> 2. pop（index）/remove(values) 对比两者优势\n",
    ">> 3. count() 查看某个元素出现的次数\n",
    ">> 4. index() 查看某个元素第一次出现的位置\n",
    ">> 5. extend() 两个list合并在一起，也可用 []+[]来实现\n",
    ">> 6. sort() list元素的排序\n",
    "\n",
    "> * 2. list的高级用法：如\n",
    ">> 1. copy() list (可变的数据类型) 复制 不等价于 赋值， 可用[:]\n",
    "来实现\n",
    ">> 2. enumerate() 枚举，可同时遍历并获取index和values.\n",
    "\n",
    "## 本周内容\n",
    "### list练习，vowels.py vowels2.py\n",
    "### list实践：\n",
    "### 初始字典："
   ]
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   "source": [
    "* vowels.py"
   ]
  },
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    "vowels = ['a','e','i','o','u']\n",
    "word = \"Milliways\"\n",
    "# 检查 word中出现的 元音，并打印出来 怎么做？\n",
    "# for letter in word:  #  第一个元素letter 请不要和已有变量重名\n",
    "                       # 第一个元素一般不定义名字，常用item（内容）来命名\n",
    "                       #                             简写 i 来命名\n",
    "                       # 第二个元素 （重要），意味着将遍历的内容\n",
    "                       # 遍历的内容一般是 序列数据  str list\n",
    "for letter in word:\n",
    "#     print(letter)\n",
    "\n",
    "                "
   ]
  },
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   "cell_type": "markdown",
   "id": "af03c500",
   "metadata": {},
   "source": [
    "* vowels2.py"
   ]
  },
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   "cell_type": "code",
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    "# 使用append () 新建列表\n",
    "found = []\n",
    "for letter in word:\n",
    "#      print(letter)\n",
    "    if letter in vowels: # letter 在 元音字母表中\n",
    "        if letter not in found: # letter 不在found表中\n",
    "            found.append(letter)\n",
    "found"
   ]
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   "cell_type": "markdown",
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   "source": [
    "### list实践"
   ]
  },
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    "购物车程序项目：\n",
    "\n",
    "要求：1、运行程序后，让用户输入支付宝余额，然后打印我们的商品列表给用户。\n",
    "\n",
    "　　   2、让用户输入商品编号进行商品的购买。\n",
    "\n",
    "　　   3、用户选择商品后，检查用户的余额是否够，若够则直接扣款，不够则提醒用户。\n",
    "\n",
    "　　   4、用户可以随时退出购买，推出时打印用户已购买的商品和支付宝余额。\n",
    "\n",
    " "
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "# 商品信息的数据存放\n",
    "commodities list = [(\"apple\",10100),\n",
    "                    (\"steak\",13402),\n",
    "                    (\"toothbrush\",10233),\n",
    "                    (\"socks\",14155)]\n",
    "\n",
    "# 用户信息的数据存放\n",
    "shopping_list = []\n",
    "\n",
    "# 输入余额\n",
    "balance = input (\"input your balance\")"
   ]
  },
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   "cell_type": "code",
   "execution_count": 2,
   "id": "05fd3764",
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    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<ipython-input-2-a84e82a58fda>, line 28)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-2-a84e82a58fda>\"\u001b[1;36m, line \u001b[1;32m28\u001b[0m\n\u001b[1;33m    while True:\u001b[0m\n\u001b[1;37m    ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
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   "source": [
    "# 商品信息的数据存放 (商品名称，商品价格，商品的编号)\n",
    "goods_list = [\n",
    "    [\"python课本\",60],  # 我们认为，每个商品的内容是一个多个值的值，可选用list\n",
    "    [\"华为手机\",8000],\n",
    "    [\"小米手环\",199],\n",
    "    [\"蜜雪冰城\",8]\n",
    "]\n",
    "# 用户购物信息的数据存放\n",
    "user_shopping_list = [] # 增加进来可考虑用append()方法\n",
    "# 用户输入余额信息\n",
    "Alipay = int(input(\"请输入支付宝的余额：\")\n",
    "# 打印商品信息\n",
    "# info = '''----- goods list -----\n",
    "# 商品编号: %s,商品名称: %s,商品价格: %s 元\n",
    "# 商品编号: %s,商品名称: %s,商品价格: %s 元\n",
    "# 商品编号: %s,商品名称: %s,商品价格: %s 元\n",
    "# 商品编号: %s,商品名称: %s,商品价格: %s 元\n",
    "# '''%(0,goods_list[0][0],goods_list[0][1],\n",
    "#      2,goods_list[1][0],goods_list[1][1],\n",
    "#      3,goods_list[2][0],goods_list[2][1],\n",
    "#      4,goods_list[3][0],goods_list[3][1],\n",
    "#  )\n",
    "# print(info)\n",
    "\n",
    "# list的长度？ len()\n",
    "             \n",
    "# 执行循环\n",
    "while True:\n",
    "   print('----- goods list -----')\n",
    "   for i in range(len(goods_list)):\n",
    "       print(\"商品编号: %s,商品名称: %s,商品价格: %s 元\"%(i,goods_list[i][0],goods_list[i]))\n",
    "\n",
    "  # 用户输入商品编号，实现商品的查询\n",
    "  choice = input(\"请输入商品的编号: \") # input输入的内容默认是字符串str 例如输入2，则显示\"2\"\n",
    "  if choice.isdigit          \n",
    "             \n",
    "  # 判断编号是否存在\n",
    "  if int(choice) < len(goods_list):\n",
    "     # 检查用户余额  > 商品价格\n",
    "     if Alipay > goods_list[choice][1]:\n",
    "        Alipay = Alipay - goods_list[choice][1] # 用户余额发生变化， 要扣除\n",
    "        user_shopping_list.append(goods_list[choice])\n",
    "     else:\n",
    "        print(\"您的余额已不足，请更换支付方式，试试花呗？\")\n",
    " else:\n",
    "    print(\"请输入正确的商品编号，您输入的商品不存在\")\n",
    "    \n",
    "     elif choice == \"退出\":\n",
    "\n",
    " # 打印用户余额和用户的商品列表信息\n",
    " print(\"用户余额: %s,购物车:\")\n",
    "      \n",
    "      "
   ]
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